期刊
MATERIALS
卷 16, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/ma16186196
关键词
ultrasonic impact treatment (UIT); T-joints; grain refinement; traction structural stress; fatigue performance; stress concentration
This study investigates the impact of ultrasonic impact treatment (UIT) on the exterior weld seam of T-joints used in orthotropic steel bridge decks. The results show that UIT increases the hardness of the weld seam by inducing localized grain refinement, leading to a significant improvement in fatigue life by 350% to 150% at different stress ratios.
This study aims to assess the effect of ultrasonic impact treatment (UIT) on the exterior weld seam of S355J2 T-joints used in orthotropic steel bridge decks. The microstructure and mechanical behavior of T-joints after UIT was investigated in this study. Fatigue tests of T-joints before and after UIT were performed. The stress concentration at the interior and exterior weld toe of T-joints was considered using the traction structural stress method. The results showed that hardness increases by 10% due to the localized grain refinement caused by UIT. UIT significantly improves the fatigue life of T-joint specimens by 350% and 150% at stress ratios of 0.1 and 0.3, respectively. As the transition angle between the weld profile and the base metal profile increases, the stress concentration factor decreases.
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